Return-flue boiler.



- No'. 889,388. l PATENTED JUNE 2, 1908.

W. MORAN.

RETURN FLUE vBOILER. er1-NATION FILED AUG. 1o. 190s. A

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PATENTED JUNE 2, 1908.

. MORAN.

W RETURN ILUE BOILER. APPLICATION Hmm .1.119.10. 190e.

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WILLIAM MORAN, OF WEST MINNEAPOLIS, MINNESOTA.

RE TURN-FLUE B OILER.

Specification of Letters Patent.

Patented June 2, 1908.

Application filed August 10, 1906. Serial No. 330,039.

To all whom. it may concern.'

Be it known that I, IVILLIAM MORAN, a citizen of the United States,residing at West Minneapolis, in the county of Hennepin and State ofMinnesota, have invented certain new and useful Improvements inReturnllue Boilers; and I do herebydeclare the following to be a full,clear, and exact-description of the invention, such as will enable' Tothe above ends the invention consists.y

of the novel devices and combinations of devices hereinafter describedand defined in the claims.

The invention is illustrated in the accompanying drawings, wherein like.characters indicate like parts throughout the several views.

Referring to the drawings, Figure 1 is a vertical section takencentrally from front to rear through a boiler designed. in accordancewith my invention. Fig. 2 is a transverse vertical section taken on theline x2 y? of Fig. 1, some parts being broken away; and Fig. 3 is ahorizontal section taken on the line ac3 x3 of Fig. 2, some parts beingbroken away.

The numeral 1 indicates the upright shell of the boiler and the numeral2 indicates the fire-box, which latter is concentrically arranged withinthe former, the two being rigidly connected at their lower extremitiesby a mud ring 3, and both being rigidly secured to a base casting 4 thatforms the ash it. p The numeral 5 indicates the grate within thefire-box, which grate may be of the usual or any suitable construction.

The numeral 6 indicates the usual door which opens into the fire-box,the wall of the fire-box being directly joined to said boiler shellsurrounding the door opening.

The smoke-box 7 is attached and projects outward from the boiler shell 1the same, as shown, being applied to the front portion thereof andhaving a large normally closed door 8. The smoke-stack or outlet flue 9leads upward from the top of the smoke-box 7. Secured to the back of theboiler and projecting outward therefrom is a flame chamber 10. The upperportion of the fire-box 2 is connected to the upper portion of thisiiame chamber 10`by means of a plurality of short flues 11 of largediameter.

Several horizontal rows of large water tubes 12 extend transverselythrough the intermediate portion of the fire-web 2 a'nd thus affordcommunication between the rear and forward portions of the annular waterleg that surrounds the fire-box, or, in other words, which lis formedbetween the fire-box and the surrounding boiler shell. These fiues arepreferably inclined slightly so as to facilitate the circulation of hotwater ina direction from the rear toward the front of the boiler. Theintermediate portions of the front and rear walls of the fire-box 2 areiiattened, as best shown in Fig. 3, so as to afford flat sheets forproper connection of the ends of the flues thereof.

Flues 13 extend transversely through the boiler shell 1 andv axiallythrough the corresponding water tubes 12, and afford conimunicationbetween the flame chamber 10 and the smoke-box 7. At one end, to-wit, asshown at their rear ends, the flues 13 are formed with largethimble-like sections 14 that are directly connected to the rear portionof the boiler shell. Rings or washers 15 are interposed between the endiianges of the flues 13 and of the thimble sections 14. The said thimblesections 14 are of at least as large diameter as the tubes 12, so thatWhen the said thimbles are removed, the said flues may be drawn endwisethrough the rear Wall of the boiler shell 1.

The intermediate portions of the front and rear walls of the boilershell 1 are flattened as best shown in Fig. 3, so as to afford fiat fluesheets to which the ends of the flues may be properly connected. Boththe boiler shell 1 and the fire-box 2 are preferably cylindrical,

except at their intermediate portions where they are fiattened, as abovedescribed. Preferably, the outer plate of the so-called flame chamber 10is made detachable so that when it is removed access may be had to theflues, and the said flues may be removed end- Wise from the boiler ifdesired.

By reference to Fig. l itwill be noted that theflames or products ofcombustion pass directly upward from the fuel, through the spaces leftbetween and around the water tubes 12 and from thence to the top of thefire-box. From the top of the fire-box the iames pass through the shortfiues 11 into the flame chamber 10 and from thence they pass to thesmokefbox 7 through the flues 13-14- It will thus be seen that thewaterwhich is circulated through the flues is subjected to radiated heat bothfrom the interior and the exterior, and at the same time it will be seenthat a large amount of heat is radiated directly into the water which iscontained in the water leg surrounding the firebox, and into the body ofwater contained in the boiler shell above the said fire-box. By thisarrangement, a boiler of extremely high heat radiating capacity isprovided. Otjherwise stated, the boiler is economical in its use of fueland is highly efficient in its heating capacity whether used to generatesteam in a steam heating plant or whether used to heat water in a hotwater heating plant. The practicability of the boiler has beendemonstrated by the actual use of a boiler designed as above described.

I/Vhat I claim is:

l. The combination with an upright boiler shell and an upright fire-boxWithin the same, which boiler shell and fire-box are cylindrical attheir upper and lower portions but have flattened front and rear walls,of water tubes extended transversely through said fire-box and exposedto the flame within the fire box, flues extended transversely throughsaid boiler shell and through said water tubes, the ends of said tubesand flues being seated in the flattened front and rear plates of thefire-box and boiler shell respectively, a flame chamber connecting theupper portion of said fire-box to one end of said flues, and a smoke-boxinto which the other end of said fiues open, substantially as described.

2. The combination with an upright boiler shell and an upright fire-boxconcentrically located within the same but spaced apart to afford asurrounding water leg, of water tubes extended transversely through saidfire-box and exposed to the flame within the fire box, flues extendedtransversely through said boiler shell and axially through thecorresponding water tubes, which flues have enlarged rear ends of atleast as large diameter as the tubes, a llame chamber attached to andprojecting outward from said boiler shell and opening into one end ofsaid flues, a plurality of relatively short flues connecting the upperportion of said fire-box to the upper portion of said flame chamber, anda smoke-box attached to and projecting outward from said boiler shelland into which the other ends of said flues open, substantially asdescribed.

3. The combination with a boiler shell and a fire-box Within said shell,which boiler shell and fire-box are cylindrical at their upper and lowerportions but have flattened front and rear walls, of water tubesextending transversely through said fire-box and with their bodyportions exposed to the flames within the fire-box and with their endssecured to the flattened front and rear plates thereof, flues extendedtransversely through said boiler shell and axially through said tubes,which flues have enlarged rear ends, the ends of said flues being seatedin the flattened front and rear plates of said boiler shell, a flamechamber secured to and projecting from the rear portion of said boilershell and communicating with the rear ends of said lines, fluesconnecting the upper portion of said fire-box to the upper portion ofsaid flame chamber, and a smoke-box connected to and projecting forwardfrom said boilerv shell and into which the front ends of said fluesopen, said smole-box having an outlet smoke-stack or flue, substantiallyas described.

In testimony whereof I aliix my signature in presence of two witnesses.

WILLIAM MO RAN.

Witnesses:

MALIE Hom., F. D. MERCHANT.

